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Three Ways to Save:Case Studies From California Green Builder

Justin DunningDirector of Green Programs

ConSolJDunning@ConSol.ws

11-21-2008

20,000 Gallons/Home/Year

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Little Box, Big Savings

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Plumbing Systems

http://blogs.suntimes.com/scanners/bath4.jpg

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Recirc

Manifold Systems

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Spinnaker Cove

Reduced Turf (<75%)x ft2Native Plants +x

WATER CONSERVATION

Option:

Weather Based Irrigation Controller (WBIC)

x Drip

Feature Total Savings (gal)Required:

Total

Recirculation DHW Piping w/ timer/temp demandDHW Parallel PipingX

560

No Recirc or Parallel

Clothes Washer with a water factor ? 6.0Toilets 1.28 gal/flush

802 ft2

802 ft2

# of toilets:

13,620

4,812

9,624

1,960

0

0

1362 ft2

0

7,000

gal.37,016

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ETo

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Baseline Usage =Area * ETo * .62

Design Usage =Area * ETo * Ks * Kmc / IE * .62

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The Final Piece

The Toilet Myth (for new Construction)

Cost

1.28 gpftoilet

~$75 added

2.0 gpmshower head

$0 added

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Savings

1.28 gpftoilet

~450 gallons/ person/yr

2.0 gpmshower head

~1400 gallons/ person/yr

So Do Both!CGBSC: Water

603 Indoor Water Use: 20% reduction in potable water use

Each plumbing fixture 20% reduced flow rate,• Showerheads 2.5 to 2.0 gpm• Lav, kitchen faucets 2.2 to 1.8 gpm• Toilets 1.6 to 1.28 gal/flush

(1.28 gpf toilets are required by code as of 7/1/2011)

or

Calculation demonstrating 20% reduction in water use baseline

No landscaping requirements

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20% Interior Water Savings

7,4759,3441.28 gpf1.6 gpfToilet

43,31853,801Total

12,848

2,409

29,200

Baseline gallons/yr

10,5121.8 gpm2.2 gpmKit. Faucet

1,9711.8 gpm2.2 gpmLav. Faucet

23,3602 gpm2.5 gpmShowerhead

NewGallons/yr

NewBaseline Fixture

Gallons based on 3 bedroom home

ICC 700Water Efficiency 801.1.1 Kitchen and bathroom run < 40 ft from water heater 2Water Efficiency 801.1.2 Kitchen and bathroom run < 30 ft from water heater 1Water Efficiency 801.1.3.a Demand recirc 6Water Efficiency 801.1.3.b parallel piping 6Water Efficiency 801.1.3.c Central Core plumbing system 8Water Efficiency 801.1.4 Point of use or demand recirc (over 40 ft from heater only) 1Water Efficiency 801.2.1 Energy Star Dishwasher 2Water Efficiency 801.2.2 Energy Star Washing Machine 8Water Efficiency 801.2.3 Washing Machine with WF < 6.0 12Water Efficiency 801.3 Garbage disposal 1Water Efficiency 801.4.1 Showerheads 2.0-2.5 gpm 4Water Efficiency 801.4.2 Showerheads < 2.0 gpm 2Water Efficiency 801.5 Lavatory faucets < 1.5 gpm 5Water Efficiency 801.6.a 1.28 toilets 18Water Efficiency 801.6.b .5 gpf urinal installed 4Water Efficiency 801.7.1 Rotating Spry heads 2Water Efficiency 801.7.2 Drip Irrigation 4Water Efficiency 801.7.3 Bublers 4Water Efficiency 801.7.4 Drip emitters 4Water Efficiency 801.7.5 Soaker hose 4Water Efficiency 801.7.6 Subsurface irrigation 6Water Efficiency 801.8 Irrigation meets EPA Water Sense 3Water Efficiency 801.9 Hydrozoning 2Water Efficiency 801.10.1 ET controller 4Water Efficiency 801.10.2 Moisture sensing controller 4Water Efficiency 801.10.3 No irrigation 15Water Efficiency 801.11.1 rainwater harvesting 6Water Efficiency 801.11.2 rainwater disrtibuted with renewable energy/gravity 2Water Efficiency 801.12 self colsing/motion sensor fixtures 3Water Efficiency 801.13 Whole house filter 1Water Efficiency 802.1.1 Grey water for toilet flushing or irrigation 10Water Efficiency 802.2 Composting toilets 32Water Efficiency 802.3 Leak detection shut off system 2

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GreenPoint Rated

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GreenPoint Rated Con’t

THANK YOU

Justin Dunning, LEED AP, GPR, Director of California Green BuilderJDunning@ConSol.ws

209.473.5076

ConSol209.473.5000